Drilling machine



G. H. GILMAN DRILLING MACHINE Original Filed Sept. 2, 1920 July 22, 1930,4

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Patented July 22, 1930 i omiso srATss GEORGEI-I. GIL-MAN, OF BOSTON, :MASSACHUSETTS nia'ILLiiie iaecrtiiin Application lcd September 2, 1920,1Sera1 No. 407,177.3. Renewed March 28, 1929. o 7f- My invention relates to machines used in the forming ot' holes, and particularly, but not exclusively, to drilling machines for i viorininLe," holes in rock and other earth forma tions. y

My invention will be liestunderstood vfrom the following description when read in .con-

nection with the accompanying drawings ot one specii'ic embodiment ot" my invention sub- .iiit'ted :for illustrative purposes,wvhile its scope will be more particularly. pointed out in the appended claims.

AAln the drawings: Y

Figure l is a central longitudinal section 1g, through the submitted embodiment of my;

invention; and

Figs. 2, 3 and e respectively are sections on the lines 2-3, 3 3 and ot F ig. l.

Referring to the drawings, lhave shown a sto nner drill in which is embodied means fork t,

feeding the drill steel to the work, percussive means 'tor impacting the drill steel, and an inndent rotation motor for rotating the is the details of these instruper se, do not torni partv of my invention, the same will be described o ly with suiucient particularity to point out tl -r application to the invention claimedv yThe percussive means illustrated comprises 301e, casing including a cylinder member l in which is reciprocably mounted a hammer piston 2. Forwardly of the cylinder the casing comprises part 3, hereinafter termed the chucl; casing, in which is rotatably mounted a chuelr provided with a polygonal bore for receiving the polygonal shank 5 of the drill steel.

As illustrated a motor and drive are pror rotating the drill steel, this motor preferably being mechanically re veis le, that is to say, they are so constructed that ir" torce is pplied to the drill steel tending to rotate it in either ot opposite di- -rectioA s the inet-or and drive will be oor spondingly rotated. To this end herein is provided a iiuid pressure actuated spur gear rotary engine and a spur gear reduction gearing, the latter connecting the engine to the rotatably' mounted chuck. The provision oIn "mechanically re'if'ersihle liuid pressure actuated means for rotating the drill steel relative to the casing among other things allows the casing to be rotated relative to the drill steel ineither ot opposite directions so as to clear obstructionspresented to the casing while the iole is being drilled. Y

f The chuck rotating engine in the present embodiment ot my invention comprises the rotary piston 6 having the rotary abutments 7 and 8 arranged at opposite sides thereof, the piston being providedl with piston vanes cooperating with the abutments and withV gear teeth meshing with gear teeth 0n thev abutinents for drivingthelatter.. The rotary piston 6 is mounted tor rotation on the reduced diameter portieri 9 of the cylinder for the hammer piston while the abutments are carried hy shafts l() and ll which respectively carry at their i'orward ends the eccentrics 12 and 13. j Y

Mounted on the eccentrics so as to be gyrated thereby is theiyolre lei provided with the internal spur gear portioirlfmeshing with the external spur gear portion 16 of the' chuck. The -yolre and eccentrics herein form a reduction gearing which constitutes partof the drive between the motor and the drill steel.

Although my invention is applicable to handle supported and mounted drilling machines it is oi particular advantage when applied to stopers. As illustrating one form of stoper l have shown, carried by the rear cylinder head l?, the stoper feed cylinder 48, which latter is provided with a piston i9 carrying the stoper piston rodQO. The stoper piston roo, as will be understood by those skilled in the art, has means for engaging the rock or suitable support in order that the drill steel may be fed to the` worlrby motive fluid admitted to the feed cylinder. l

ils illustrating a control for the machine l have shown mounted inthe cylinder head l? a throttle valve 18 the latter provided with a central conduit 19 adapted to be placed in 95 lcommunica-tion with the source of moti-ve fluid. is will be understood by those skilled in the art, this valve is adapted to control ports and passages for admitting motive fluid into the feed cylinder, to feed the drill steel 10.

up to the work, and into the percussive cylinder for operating the piston. rlhis valve, the details of which form no part of the present invention, may be the known form of turning plug used in stoping drills, as for eX- ample that shown in United States patent to Taylor, $95,702, granted September l5, 1908.

For reciprocating the hammer piston I herein have formed the cylinder with a bore 21 of relatively large diameter and a bore 22 of relatively small diameter, and have formed the piston with the large diameter portion 23 and relatively smaller diameter portion 24, the latter connected to the large diameter portion by a reduced diameter portion 25. The air admitted from the throttle valve 18 passes into the rearward end 26 of the small diameter portion of the cylinder, whence it linds its way through one or more passages 27 to the groove 28 at the forward end of said portion, the rearward end of the cylinder an d groove 28 thus constituting what are usually termed in the art constant pressure chambers. Leading from the intermediate portion of the smaller diameter portion 9A; of the cylinder to the forward end of the cylinder portion 23 of larger diameter is a passage 29. From the intermediate portion of the portion of'larger diameter leads an exhaust passage 30 connecting said portion with the atmosphere, and adapted to be covered and uncovered by the piston in its reciprocations to exhaust motive fluid from opposite sides of the piston.

lVhen the piston is in the position shown by Fig. 1, the motive fluid is admitted from tween the chamber 28 and the rearward end of the cylinder portion of larger diameter is interrupted, and at the forward end of the stroke the rearward end of the smaller diameter portion of the piston uncovers the rearward end of the passage Q9 to admit fluid from the constant pressure space 26 through the said passage to the forward end of the cylinder, and, as at this time the rearward end of the cylinder portion of larger diameter is open to the atmosphere through the port 30, the piston returns to the positiorL shown by Fig. l.

For bodily rotating the machine I herein have provided a rotation handle 31 carried by the rear cylinder head and pivoted at 44 to be turned to project at right angles to the machine. In order to permit this handle to rotate the steel l herein have provided means for locking the steel against rotation,

and, although l may lock any part of the motor or drive to secure this result, I preferably lock the chuck to the chuck casing in order to take the strain olf the gearing which would exist if the other arrangements were eniployed. To this end, l herein provide the chuck casing with a transversely formed boss 32 in which is slightly mounted a bolt having the parallel portions 3f-il and 35 and connecting portion 36. On the forward end of the portion 35 l have shown a detent 3? adapted to engage complementary recesses 38 f-orined in the exterior surface of the chuck. For operating the bolt .l have illustrated the saine as provided ith handle 3), and for holding the same in its locked and unlocked positions l may provide the recesses el() adapte-d to be engaged by the spring-pressed pin 4i. As will he obvious, when the bolt is in the position shown by Fig. 4,-tlie chuck is prevented from rotating, and under such conditions the drill may be rotated by the handle 3l. lllhen the holt moved to disengage the chuck, the motor may rotate the drill if the cylinder is revented from rotating by means of the handle 3l.

It will be understood that, although l have shown the lock as applied to an overhead stoping` machine, where it is of particular advantage, it may also be advantageously applied to all forms of machines with which it may be desired. to manually rotate the drill steel and whether or not the drive is reversible.

ils shown in Fig. 2, the motor for rotating the drill is provided with inlet passages l2 and exhaust pass ges rllhe inlet passages 42 are both in constant communication with the continuous pressure space QG of the drilling machine, one of these passages being shown in l? l., the other passage, not shown, bei-ng simile. ly constructed. Both exhaust passages 43 are directed forwardly and open to the atmosphere through ports lf-l formed in the shoulder 45, one exhaust passage being shown in Fig. 1 and the other being similarly constructed.

lt will be noted that l ha e provided a drilling machine having` extensible feeding means and percussive means for operating the tool, and have further )L irovi ded manual means and a mechanically reversible power means for rotating the tool, and that when the steel is locked against rotation by the power means, the same may be rotated by the manual means.

It will be understood that within the scope of the invention wide deviations may be made from the specific. embodiment there of herein described without departing from the spirit of the invention.

Claims:

l. A rock drilling machine having, in coinbination, a casing, an extensible feeding device operatively secured to said casing, said 10. A stoping machine having, in combination, a feed cylinder member and a cooperating feed piston member, a hamm-er drill having a casing member connected to one of said feed members, a substantially radially disposed rotation handle carried by one of said members, a chuck rotatably mounted on said casing member of said hammer drill, a mechanically reversible motor carried by said hammer drill for rotating said chuck, a mechanically reversible reduction gearing car ried by said hammer drill for operatively connecting said motor to said chuck, and releasable means operative at will to prevent rotation of said chuck relative to said casing.

ll. A stoping machine having, in combination, a feed cylinder member and a cooperating feed piston member, hammer drill having a casing member connected to one of said feed members, a substantially radially disposed rotation handle carri d by one of said members, adifferential hammer piston in said casing of said hammer drill, said casing having a constant pressure chaniber for a portion of said hammer piston, a chuck rotatably mounted on said casing of said hammer drill, a mechanically reversible motor carried by said hammer drill for rotating said chuck, conduit means supplying said motor With operating pressure fluid from said constant pressure chamber, a mechanically reversible reduction gearing carried by said hammer drill for operativel7 connecting said motor and chuclr, and releasable means operative at will to prevent rotation of said chuck relative to said casing.

l2. A rock drilling machine having, in combination, a casing', a hammer piston for operating a drill steel, a chuck rotatably mounted in said casing, said chucl formed for carrying said drill steel in such. manner that 'when said chuclr is rotated said drill steel must rotate with it, a fluid pressure.

operated motor and reduction gearing operatively connected to said chuck in such manner that when said motor is in operation said chuck will be rotated relatire to said casing, and releasable means operative to lock said chuck directly to said casing to prevent relative rotation between ther 13. A rock drilling machine having, in combination, a easing, a hammer piston in said casing for operating a drill steel, drill steel supporting and rotating means rotatably mounted on said casing, fluid pressure operated motor and reduction gearing means carried by said casing for driving said drill steel supporting and rotating means, and locking means carried by said casing for releasably engaging said drill steel supporting and rotating means, said locking means op erative independently of said motor and reduction gearing means to secure said supporting and rota-ting means nou-rotatably to said casing.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN.

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